In 1840, the Penny Black, the world’s first adhesive postage stamp, was issued in Great Britain.
In 1866, racial violence broke out in Memphis, Tennessee; over a three-day span, 46 African Americans were killed.
In 1898, the U.S. Navy, led by Commodore George Dewey, defeated the Spanish Pacific fleet at Manila Bay in the first battle of the Spanish-American War.
In 2011, President Barack Obama announ…